1 /*
2 * Copyright (C) 2011 The Guava Authors
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
5 * in compliance with the License. You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software distributed under the License
10 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
11 * or implied. See the License for the specific language governing permissions and limitations under
12 * the License.
13 */
14
15 package com.google.common.util.concurrent;
16
17 import com.google.common.annotations.Beta;
18 import com.google.common.annotations.GwtIncompatible;
19 import com.google.errorprone.annotations.CanIgnoreReturnValue;
20 import java.util.concurrent.AbstractExecutorService;
21 import java.util.concurrent.Callable;
22 import java.util.concurrent.RunnableFuture;
23 import org.checkerframework.checker.nullness.qual.Nullable;
24
25 /**
26 * Abstract {@link ListeningExecutorService} implementation that creates {@link ListenableFuture}
27 * instances for each {@link Runnable} and {@link Callable} submitted to it. These tasks are run
28 * with the abstract {@link #execute execute(Runnable)} method.
29 *
30 * <p>In addition to {@link #execute}, subclasses must implement all methods related to shutdown and
31 * termination.
32 *
33 * @author Chris Povirk
34 * @since 14.0
35 */
36 @Beta
37 @CanIgnoreReturnValue
38 @GwtIncompatible
39 @ElementTypesAreNonnullByDefault
40 public abstract class AbstractListeningExecutorService extends AbstractExecutorService
41 implements ListeningExecutorService {
42
43 /** @since 19.0 (present with return type {@code ListenableFutureTask} since 14.0) */
44 @Override
45 protected final <T extends @Nullable Object> RunnableFuture<T> newTaskFor(
46 Runnable runnable, @ParametricNullness T value) {
47 return TrustedListenableFutureTask.create(runnable, value);
48 }
49
50 /** @since 19.0 (present with return type {@code ListenableFutureTask} since 14.0) */
51 @Override
52 protected final <T extends @Nullable Object> RunnableFuture<T> newTaskFor(Callable<T> callable) {
53 return TrustedListenableFutureTask.create(callable);
54 }
55
56 @Override
57 public ListenableFuture<?> submit(Runnable task) {
58 return (ListenableFuture<?>) super.submit(task);
59 }
60
61 @Override
62 public <T extends @Nullable Object> ListenableFuture<T> submit(
63 Runnable task, @ParametricNullness T result) {
64 return (ListenableFuture<T>) super.submit(task, result);
65 }
66
67 @Override
68 public <T extends @Nullable Object> ListenableFuture<T> submit(Callable<T> task) {
69 return (ListenableFuture<T>) super.submit(task);
70 }
71 }